second HW

three files/func.c

+#include <stdio.h>
+#include "func.h"
+
+int func_name_or_id(){
+#ifdef PRINT_ID
+	printf("201723267\n");
+	return 0;
+
+#else 
+	printf("LEESANGKYEONG\n");
+	return 1;
+#endif
+}
+

three files/func.h

+extern int func_name_or_id();

three files/main.c

+#include <stdio.h>
+#include "func.h"
+
+
+int main(){
+
+	printf("%d\n", func_name_or_id());
+}
+